Unlock instant, AI-driven research and patent intelligence for your innovation.

Area active backlight with steerable light source

a technology of backlight and area, which is applied in the direction of planar/plate-like light guides, lighting and heating apparatus, instruments, etc., can solve the problems of not being able to selectively control the light provided by the backlight 110 to different regions of the display, and absorbing a large amount of ligh

Inactive Publication Date: 2011-09-27
SHARP KK
View PDF31 Cites 21 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach enhances contrast ratio, reduces power consumption, minimizes motion blur, and maintains a wide color gamut while decreasing the number of drivers needed, thus lowering costs and improving image quality.

Problems solved by technology

Since the panel is not completely transparent, a substantial part of the light is absorbed while it transits the panel and images displayed on this type of panel may be difficult to see except under the best lighting conditions.
However, a layer of translucent liquid crystals occupies a cell gap separating the two polarizers.
Unfortunately, the light provided by the backlight 110 can not be selectively controlled to different regions of the display.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Area active backlight with steerable light source
  • Area active backlight with steerable light source
  • Area active backlight with steerable light source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0033]It is desirable to include an active backlight which selectively provides light to different regions of the display to improve the image quality. Such regions of the display may be as small as a pixel, or sub-pixel, or a fraction of a sub-pixel, but in general are significantly larger than a pixel and are preferably patterned so that it produces uniform light output for uniform input. In addition, being able to selectively reduce the backlight in different regions of the display also decreases the overall power consumption of the display. However, two dimensional backlights traditionally require a separate driver for each active unit, which is relatively expensive for a large display area.

[0034]A display may include a series (or plurality) of single light emitting diodes arranged in a parallel fashion along the edge of the display, or other light sources, each of which provides illumination to a one-dimensional striped region across the display. The light sources may likewise ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
critical angleaaaaaaaaaa
refractive indexaaaaaaaaaa
frequencyaaaaaaaaaa
Login to View More

Abstract

A liquid crystal display includes a backlight. The backlight includes a plurality of waveguides to selectively direct light. A set of selection elements in combination with the backlight selectively direct light to the front of the display.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation-in-part of U.S. patent application Ser. No. 12 / 322,115, filed Jan. 28, 2009.BACKGROUND OF THE INVENTION[0002]The present invention relates to a liquid crystal panel, and in particular to a liquid crystal panel with a steerable light source.[0003]The local transmittance of a liquid crystal display (LCD) panel or a liquid crystal on silicon (LCOS) display can be varied to modulate the intensity of light passing from a backlit source through an area of the panel to produce a pixel that can be displayed at a variable intensity. Whether light from the source passes through the panel to an observer or is blocked is determined by the orientations of molecules of liquid crystals in a light valve.[0004]Since liquid crystals do not emit light, a visible display requires an external light source. Small and inexpensive LCD panels often rely on light that is reflected back toward the viewer after passing through the ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(United States)
IPC IPC(8): G02F1/1335G02B6/00
CPCG02B6/005G02B6/3536G02B6/0078G02B6/3522G02F1/1334G02F2001/133601G02F1/133601
Inventor FENG, XIAO-FAN
Owner SHARP KK